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package net.micode.notes.data; // 定义包名
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import android.content.ContentValues; // 用于存储数据的键值对，便于数据库操作
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import android.content.Context; // 用于访问应用环境和资源
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import android.database.sqlite.SQLiteDatabase; // 用于执行SQL语句和进行数据库操作
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import android.database.sqlite.SQLiteOpenHelper; // 管理数据库创建和版本控制的帮助类
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import android.util.Log; // 用于日志输出
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import net.micode.notes.data.Notes.DataColumns;
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import net.micode.notes.data.Notes.DataConstants;
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import net.micode.notes.data.Notes.NoteColumns;
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// 导入相关类，用于定义数据库表格的列名和常量
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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private static final String DB_NAME = "note.db"; // 数据库名称
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private static final int DB_VERSION = 4; // 数据库版本号
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public interface TABLE {
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public static final String NOTE = "note"; // 笔记表名称
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public static final String DATA = "data"; // 数据表名称
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}
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private static final String TAG = "NotesDatabaseHelper"; // 日志标签
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private static NotesDatabaseHelper mInstance; // 单例模式中的实例
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// 创建笔记表的SQL语句
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private static final String CREATE_NOTE_TABLE_SQL = "CREATE TABLE " + TABLE.NOTE + "(" +
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// 定义各列及其数据类型和约束条件
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")";
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// 创建数据表的SQL语句
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private static final String CREATE_DATA_TABLE_SQL = "CREATE TABLE " + TABLE.DATA + "(" +
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// 定义各列及其数据类型和约束条件
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")";
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// 创建索引以加快根据NOTE_ID查询的速度
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private static final String CREATE_DATA_NOTE_ID_INDEX_SQL = "CREATE INDEX IF NOT EXISTS note_id_index ON " +
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TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
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// 定义触发器，当笔记移动到文件夹时增加文件夹中的笔记计数
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = "CREATE TRIGGER increase_folder_count_on_update " +
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// 触发器定义及逻辑
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" END";
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// 定义触发器，当笔记从文件夹中移出时减少文件夹中的笔记计数
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = "CREATE TRIGGER decrease_folder_count_on_update " +
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// 触发器定义及逻辑
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" END";
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// 定义触发器，当向文件夹中插入新笔记时增加文件夹中的笔记计数
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER = "CREATE TRIGGER increase_folder_count_on_insert " +
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// 触发器定义及逻辑
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" END";
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// 定义触发器，当从文件夹中删除笔记时减少文件夹中的笔记计数
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER = "CREATE TRIGGER decrease_folder_count_on_delete " +
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// 触发器定义及逻辑
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" END";
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// 定义触发器，当插入新数据时更新笔记的内容摘要
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER = "CREATE TRIGGER update_note_content_on_insert " +
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// 触发器定义及逻辑
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" END";
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// 定义触发器，当数据更新时更新笔记的内容摘要
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER = "CREATE TRIGGER update_note_content_on_update " +
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// 触发器定义及逻辑
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" END";
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// 定义触发器，当数据删除时清除笔记的内容摘要
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER = "CREATE TRIGGER update_note_content_on_delete " +
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// 触发器定义及逻辑
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" END";
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// 定义触发器，当删除笔记时同时删除相关的数据
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private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER = "CREATE TRIGGER delete_data_on_delete " +
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// 触发器定义及逻辑
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" END";
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// 定义触发器，当删除文件夹时同时删除文件夹中的所有笔记
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private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER = "CREATE TRIGGER folder_delete_notes_on_delete " +
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// 触发器定义及逻辑
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" END";
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// 定义触发器，当文件夹移动到垃圾桶时将文件夹中的所有笔记也移动到垃圾桶
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private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER = "CREATE TRIGGER folder_move_notes_on_trash " +
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// 触发器定义及逻辑
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" END";
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public NotesDatabaseHelper(Context context) {
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super(context, DB_NAME, null, DB_VERSION); // 调用父类构造函数
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}
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public void createNoteTable(SQLiteDatabase db) {
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db.execSQL(CREATE_NOTE_TABLE_SQL); // 执行创建笔记表的SQL语句
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reCreateNoteTableTriggers(db); // 重新创建笔记表的触发器
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createSystemFolder(db); // 创建系统文件夹
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Log.d(TAG, "note table has been created"); // 输出日志
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}
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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// 删除旧的触发器
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db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
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db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
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db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
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db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
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// 创建新的触发器
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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
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db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
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db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
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db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
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}
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private void createSystemFolder(SQLiteDatabase db) {
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ContentValues values = new ContentValues();
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// 创建系统文件夹
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values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);
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// 创建其他系统文件夹
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// ...
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}
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public void createDataTable(SQLiteDatabase db) {
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db.execSQL(CREATE_DATA_TABLE_SQL); // 执行创建数据表的SQL语句
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reCreateDataTableTriggers(db); // 重新创建数据表的触发器
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db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); // 创建索引
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Log.d(TAG, "data table has been created"); // 输出日志
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}
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private void reCreateDataTableTriggers(SQLiteDatabase db) {
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// 删除旧的数据表触发器
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
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// 创建新的数据表触发器
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
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}
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static synchronized NotesDatabaseHelper getInstance(Context context) {
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if (mInstance == null) {
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mInstance = new NotesDatabaseHelper(context);
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}
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return mInstance;
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}
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@Override
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public void onCreate(SQLiteDatabase db) {
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createNoteTable(db); // 创建笔记表
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createDataTable(db); // 创建数据表
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}
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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// 数据库版本升级逻辑
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}
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private void upgradeToV2(SQLiteDatabase db) {
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// 升级到版本2的逻辑
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}
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private void upgradeToV3(SQLiteDatabase db) {
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// 升级到版本3的逻辑
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}
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private void upgradeToV4(SQLiteDatabase db) {
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// 升级到版本4的逻辑
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}
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}
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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.widget;
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import android.appwidget.AppWidgetManager;
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import android.content.Context;
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import net.micode.notes.R;
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import net.micode.notes.data.Notes;
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import net.micode.notes.tool.ResourceParser;
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public class NoteWidgetProvider_2x extends NoteWidgetProvider {
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// 当小部件更新时调用
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@Override
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public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
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// 调用父类的update方法
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super.update(context, appWidgetManager, appWidgetIds);
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}
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// 获取小部件布局ID
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@Override
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protected int getLayoutId() {
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return R.layout.widget_2x;
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}
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// 获取小部件背景资源ID
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@Override
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protected int getBgResourceId(int bgId) {
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// 调用ResourceParser获取2x小部件的背景资源ID
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return ResourceParser.WidgetBgResources.getWidget2xBgResource(bgId);
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}
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// 获取小部件类型
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@Override
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protected int getWidgetType() {
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// 返回2x小部件的类型
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return Notes.TYPE_WIDGET_2X;
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}
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}
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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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Java
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package net.micode.notes.widget;
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import android.appwidget.AppWidgetManager;
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import android.content.Context;
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import net.micode.notes.R;
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import net.micode.notes.data.Notes;
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import net.micode.notes.tool.ResourceParser;
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public class NoteWidgetProvider_4x extends NoteWidgetProvider {
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// 当小部件更新时调用
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@Override
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public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
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// 调用父类的update方法
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super.update(context, appWidgetManager, appWidgetIds);
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}
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// 获取小部件布局ID
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protected int getLayoutId() {
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return R.layout.widget_4x;
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}
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// 获取小部件背景资源ID
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@Override
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protected int getBgResourceId(int bgId) {
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// 调用ResourceParser获取4x小部件的背景资源ID
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return ResourceParser.WidgetBgResources.getWidget4xBgResource(bgId);
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}
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// 获取小部件类型
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@Override
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protected int getWidgetType() {
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// 返回4x小部件的类型
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return Notes.TYPE_WIDGET_4X;
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}
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}
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Loading…
Reference in new issue